Improvement in machines for making screw-threaded stock



s. VANSTONE.

MACHINE FOR MAKING SCREW-THREADED STOCK No.186,906.

Patented J'an.30, 1877.

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N. FE ER5 PHOTO-\JTHOGRAPnER WASHXNGYON n u UNITED STATES SAMUELVANSTONE, OF PROVIDENCE, RHODE ISLAND, ASSIGNOR OF ONE- HALF HIS RIGHTTO JOHN W BOARD, OF SAME PLACE.

IMPROVEMENT IN MACHINES FOR MAKING CREW-THREADED STOCK.

Specification forming part of Letters Patent No. 186,906, dated January30, 1877; application filed September 2, 1876.

To all whom it may concern:

Be it known that I, SAMUEL VANSTONE, of Providence, in the county ofProvidence and State of Rhode Island, have invented a certain new anduseful Improvement in Machines for Making Screw-Threaded Stock for Nailsand Screws; and I do hereby declare that the following is a full, clear,and exact description thereof, which will enable others skilled in theart to which it appertains to make and use the same, reference being badto the accoinpanying drawings. and to letters of reference markedthereon, which form a part of this specification.

My invention consists in a machine adapted to impart a particular shapeto, and to form a thread upon, a wire, substantially such as are shownand described in an application made by myself and John W. Hoard, forUnited States Letters Patent, which was allowed on or about July 26,1876, and in certain details of construction hereinafter moreparticularly set forth.

Figure 1 is a side elevation; Fig. 2, an end elevation, and Fig. 3 alongitudinal vertical section, of a machine embodying my improvements;Fig. 4, a detail of the adjustable hub; Fig. 5, a section (enlarged) ofwire prepared for threading; Fig.6, portions of the threaded wire; Figs.7 and 8, end view and cross-section ofthe same; Fig. 9, a cross-sectionof wire prepared with flat, instead of grooved, sides; Fig. 10, asection of one of a pair of rollers, adapted for making the same; andFig. 11, a modification of the adjustable hub.

A is a frame of any suitable kind, adapted to support the rolls B O,which are provided with appropriate gearing D E, whereby one may bedriven by the other. The grooves F F are made, as shown, each somewhatin excess of a semicircle, so that the two may impart to the wire, whichis rolled through be tween them, a form in cross-section oblong orsomewhat elliptic; and each of these grooves has a central rib or head,g, the object of which is to impart to the wire longitudinal depressionsor grooves h h, as shown in Fig. 5, representing the wire at this stage.I I are other grooves, (which may be in the same pair of rollers withthe grooves F F, or in independent rollers, as desired,) designed fortaking the wire, after it has been reduced by the grooves F F to theelliptical and longitudinally-grooved form just described, and reducingit to its ultimate form, having a cylindrical cross-section, withpeculiar raised threads thereon, as shown in Figs. 6, 7, and 8. Thesegrooves I I are each semicircular in cross-section, as shown, but thegrooves are also scored diagonally, as shown atjj, these scores beingeach of somewhat crescent shape, being deepest and broadest at thecenter, and terminating or diminishing to nothing at their ends. Thuseach roller 1 imparts to the wire its own set of raised crescent-shapedthreads, extending only about half-way around the wire in a spiraldirection, the opposite side of the wire having similar threads, notdirectly connected with those on the other side, but yet in spiral linetherewith. In passing the wire from the grooves F F to l I the wireenters the rolls I I, with its grooves 71. h in horizontal line witheach other, and with the larger diameter ac y vertically, so that therolls shall compress the main body of the wire to a cylindrical form,

while leaving a portion of the metal in the scores j j to form thethreads, and the same action forces the excess of metal together toclose the longitudinal grooves h It, thus preventing the formation ofwebs or fins lengthwise ot' the Wire where the peripheries of therollers meet.

From the above description it will be seen that the peculiar formimparted to the wire by the grooves F prepare it for receiving theraised thread by having for this purpose a larger supply of metal at itslarger diameter an, and that the avoidance of longitudinal webs or finsis insured by making the grooves h h, through the instrumentality of theribs or beads g.

The series of scores j j, I prefer should be alternated with blankspaces k 70, so that the threaded wire shall, when severed at such blankspaces,'(say at or about 1,) give a short unthreaded portion at eachend, to form the head and point of the complete nail or screw; such headmay be upset, if desired, or left cylindrical; and the opposite end canbe at will turned down to a point by any appropriate means. The rollsare made adjustable for varying the pressure by any well-known meansas,for instance, by set-screws m m.

For the purpose of adjusting one of the rolls relatively to the other,in order that the scores jj of both may be properly positioned orregistered to each other, to cause the threads of the wire to alignspirally, I have devised the following means, and by which I can attainthe nicest and most exact adjustment without disengaging or disturbingthe gears D E. I provide a hub, N, adapted to be splined to the axis ofone of the rollers, (preferably the lower one,) so that when so splinedthey must revolve together as one. This hub lodges in a circular cavity,0, made in the outer face of the gear, and is then secured to it bymeans of set-screws p p p, which pass through elongated holes or shortslots gqq in this hub. When the hub is, by means of these screws, heldfirmly to the gear, after the rolls have been previously adjusted toeach other by turning the adjustable one a trifle upon its axis, thewhole is firm, and the adjustment will have been made withoutdisconnecting the teeth of the gears. Upon the occurrence of any, theslightest, disarrangement during the working of the machine areadjustment can be readily made, as above stated.

Instead of the positive ridges or beads g, the bottom of the grooves F Fmay as shown in Fig. 10, the object being still to so form the wire asto prevent longitudinal webs or films; but in any case the Wire must besomewhat elliptic in cross-'section,-so as to give it a form having alonger and a shorter diameter.

By my machine it will be seen that the coil or continuous wire, as it isfed or drawn through the forming-rollers, is simply drawn, and that thewire does not turn or revolve upon its axis.

As an equivalent for the adjustable hub above'desoribed, though perhapsbetter adapted for the larger and stronger machines, the hub may havearms r 1, adjustable, by setscrews, to the desired position on thegearwheel, as shown in Fig. 11.

The blank spaces k 70, between the several sets or groups of scores, maytaper, if desired, and they'may be a little shallower, or a littledeeper, than the threaded or scored part. In

running the wire stock through the rolls orthe wire a form somewhatelliptical in crosssection, and having longitudinal grooves therein,substantially as shown and described.

2 In a machine for making a thread or threads on a continuous wire,shaping-rollers, provided with grooves having diagonal scores therein,and adapted to, produce a true cylindrical stock, having raised threadsthereon, alternating with the cylindrical unthreaded portions,substantially as and for the purpose set forth.

3. The combination, with a pair of geared rolls, each provided withdiagonal scores j therein, for the purpose described, of an adjustablehub, applied to the shaft and to the gear of one of such rolls, wherebythe scores of the two rolls may be adjusted relatively to 'each otherwithout disconnecting the gears.

SAMUEL VAN STONE.

Witnesses:

JOHN 0. Poems, HENRY K. POTTER.

